Everythjng can be justified one way or another. Even if the justification is just profit. Whether or not anyone agrees with the justification is a different story.
Big difference between "hey that country is screwing over this country"
And
"Hey lets invade this little guy because he might join NATO, that way we can double the number of NATO states on our border"
Even if you want to paint Korea and VN in a similar light to what Russia is doing, I'd say trying to prevent Russian funded communist invasions (and the inevitable genocides that always follow) is about as righteous as it gets.
Russia has huffed too much of it's own glue. They think their hands are rated E for everyone, yet after 2 years they're further away from their goals than they were at day 1 of their war, and they had their most elite division get decimated by militas and reservists